coded experimental design

synonym: coded design
https://doi.org/10.1351/goldbook.10067

Matrix of runs by factor levels in which each level is denoted by a code that represents the relative magnitude of the level.

Examples:
  1. A two-level design is coded \(-1\) and \(+1\), a three-level design is coded \(-1\), \(0\) and \(+1\).
  2. In a rotatable central composite design for three factors the coded levels are \(-\sqrt 2\), \(-1\), \(0\), \(+1\), \(+\sqrt 2\).
Source:
PAC, 2016, 88, 407. (Vocabulary of concepts and terms in chemometrics (IUPAC Recommendations 2016)) on page 414 [Terms] [Paper]